repairing termite damage with wood filler in Florida

It's the pine windowsill (almost all of it) and window frame. Is that too much to repair with wood filler? Is there a good wood filler or is it too much of a bandaid?

When I easily stuck a screwdriver in the wood, (carpenter?) ants escaped. Should I treat for the ants now or wait for the carpenter to tear the wood out and ask him to kill them? Seems to me if I wait, the ants might be exposed better and killed better? Thanks for your help.

I would not mess with the outside.
No one's even seen a picture of this window, or is on site to look at it, and even if someone was there, there not going to have X-ray vision. So there's no telling how long or how expensive it will be until it's opened up.
If they just drill a hole and shoot some chemical in, it may or may not take care of the problem.

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understood

A little side story.
For many years my mother complained to my dad that she could hear crunching noises when she was in the bathroom at there summer camp inside the sliding door.
Well if you knew my mother, she was a little out there so no one paid much attention.
Once in a while you would see an ant and someone would just kill it.
Many years after my mother passed we were doing some remodeling and found enough carpenter ants to fill 5 gal buckets.
We removed the old hollow core door and found the whole inside solid full of ants.

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bug man identified ants as Argentine ants...

...and said they were eating the fungus that grows on termite-damaged wood. I always agreed with you that I should tear the wall out, but I, at least, wanted to get the bug man out here immediately to take care of 1 out of 2 issues.

He sprayed all the windowsills, floorboards, and outside around the house and said they would be crawling the walls if I didn't exterminate. (He's been doing it for 42 years here in Florida, same location.)

If I sent you a picture, it would just show a window with termite damage around the frame and lines of cracks in the windowsill. But you're right; I need to tear it out. I just hope the spraying will buy me some time.

It's a good thing your mother kept nagging your father to listen to her.